"While the State exists there can be no freedom; when there is freedom there will be no State." — Vladimir Lenin.
But one of my personal favourites is:
"Freedom only for the supporters of the government, only for the members of one party – however numerous they may be – is no freedom at all. Freedom is always and exclusively freedom for the one who thinks differently. Not because of any fanatical concept of ‘justice’ but because all that is instructive, wholesome and purifying in political freedom depends on this essential characteristic, and its effectiveness vanishes when ‘freedom’ becomes a special privilege." — Rosa Luxemburg.